kernel: Add coretemp driver to x86_64 build

The x86_64 build already has the k10temp driver for AMD processors
built in, so this patch adds the coretemp driver for the same
functionality on Intel processors.

Signed-off-by: Michael Marley <michael@michaelmarley.com>

target/linux/x86/64/config-default

@@ -264,6 +264,7 @@ CONFIG_SCHED_MC=y
 CONFIG_SCHED_SMT=y
 # CONFIG_SCIF_BUS is not set
 CONFIG_SCSI_VIRTIO=y
+CONFIG_SENSORS_CORETEMP=y
 CONFIG_SENSORS_K10TEMP=y
 CONFIG_SERIAL_8250_PNP=y
 CONFIG_SMP=y